to be eligible to be selected in the Australian Team & receive an Australian Team Medal the player must meet the "Player Eligibility Guidelines" as per Article 14 of the WEPF By-Laws.
Reference: (only quoting part of)
Player Eligibility, (as per WEPF constitution)
3. No player will be allowed to play for another Country, once he / she has played for any country, unless the player emigrates and takes up the nationality of that Country.
5. Once a player has played for one country in the World Championships, then they cannot play for any other country the following year or subsequent years, except when the player takes up citizenship of that other country....